PatchTheCVElwext4 vulnerabilities and fixes
Recent CVEs affecting lwext4, with upgrade or downgrade steps. 2 tracked.
lwext4 has 2 tracked vulnerabilities, 0 critical. A fixed release or vendor patch exists for 0. Most recent: 2026-06-03. Highest priority: CVE-2025-70101 (score 33/100).
- CVE-2025-70101 MEDIUM 6.5 DOWNGRADE An out-of-bounds read in the ext4_ext_binsearch_idx function in src/ext4_extent.c of the lwext4 1.0.0 library
- CVE-2025-70100 MEDIUM 5.5 DOWNGRADE A divide-by-zero vulnerability in the ext4_block_set_lb_size function in src/ext4_blockdev.c of the lwext4 1.0
FAQ
How do I fix lwext4 vulnerabilities?
Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.
Is lwext4 being exploited right now?
None of the tracked lwext4 CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.
Which lwext4 CVE should I patch first?
CVE-2025-70101 currently ranks highest (33/100): An out-of-bounds read in the ext4_ext_binsearch_idx function in src/ext4_extent.c of the lwext4 1.0.0 library .